Suction box for paper-making machines



Jan. 31, 1928.

F. J. LATHAM SUCTION BOX FOR PAPERMAKING MACHINES Filed Sept. 16, 1925$371M WW guru-W01 @3 l 04 h Patented Jan. 31, 1928.

UNITED STATES PATENT OFFICE.

FRED J. LATEAM, OF RUMFORD, MAINE, ASSIGNOB. TO THE OXFORD P APERCOMPANY,

A CORPORATION OF MAINE.

SUCTION BOX FOR PAPER-MAKING MACHINES.

Application filed September 16, 1925. Serial No. 56,592.

My invention relates particularly to sue-- ilOIl boxes used for theremoval of the water from paper making machines, and is applicable topaper making machines of various diiierent kinds.

The object of my invention is to provide suction boxes for paper makingmachines having many advantages over previous types of suction boxes.More particularly, the object is to provide an improved cover forsuction boxes, that is to say, an improved construction for the upperportion of the suction boxes, which is adapted to support theFourdrinier wire carrying the paper 1 web to be dried. Suction boxesmade in accordance with my invention have the advantage of wearin offlevel and smooth and not in ridges un er the Fourdrinier wire supportedthereby. In carrying out my invention I may accomplish this urpose byproviding suction box covers ma e of pieces of wood of such a characteras to wear ofli' smoothly and without the formation of any substantialridges under the action of the B Fourdrinier wire. Preferably, for thispurpose I provide such covers made of wood and in which the grain runsso that the longitudinal rain of the wood extends in a direction cuttingthrough the path of movement of the Foudrinier wire, for example,

vertically, or at right angles to the plane of the Fourdrinier wire.'These covers may be supported in any desired manner but I prefer tosupport them in metal supports having appropriate recesses for receivingthe same. A further object is to provide covers of this character so asto not only prevent the formation of uneven surfaces on the covers butalso so as to prevent the forma- W tion of ridges in the Fourdrinierwire with consequent possibility of dama to the paper web. Again, afurther 0 ject is to obviate the necessity of planing off the top of thecover at frequent intervals during the life of a Fourdrinier wire,inasmuch as covers made in accordance with my inven tion need not beplaned down except, perhaps, when changing to a new Fourdrinier wire.Accordingly, there is a saving of time and labor in using covers made inaccordance with my invention.

Further objects of my invention will appear from the detaileddescription of the same hereinafter.

While my invention is capable of embodiment in many diiferent forms forthe purpose of illustration I have shown only one orm of the same in theaccompanying drawings, in which Figure 1 is a diagrammatic sideelevation of a paper making machine equipped with suction boxes made inaccordance with my mvention;

Figure 2 is a plan view of the same;

Figure 3 is an enlarged vertical section of one of the suction boxes;

Figure 4 is an enlarged vertical section of the same taken at rightangles to Figure 3 on line 4-4 therein; and

Fi re 5 is a plan view of one of the suction ox covers. In the drawingsI have shown a paper making machine comprisin a stock supply box 1 and abreast-roll 2 For supporting a Fourdrinier wire 3 at one end of themachine. Said wire passes over a plurality of table-rolls 4 and thenceover two suction boxes 5 and 6, a supporting-roll 7, then between asupporting-roll 8 and a dandy-roll 9 and thereafter over two furthersuction boxes 10 and 11. From this point the wire pas es over aguide-roll 12, a suction-couchroll 13 and thence in the reversedirection in contact with five wire carrying and stretch rolls 14, 15,16, 17 and 18. Each of the suction boxes is comprised of a housing 19provided with a vacuum chamber 20 therein supplied with a vacuum fromany suitable source. In the interior of the hous ing there are anvdesired number of supporting bridges 21 shaped like an inverted U andadapted to support at their upper portions a number of'suction boxcovers, each of which is comprised of a metal grooved support 22 havinga dovetailed recess 23 therein and secured to the housing 19 and thebridges 21 by means of screws 24. The dovetailed rece s 23 is providedfor receiving a plurality of wooden blocks 25, 26 and 27 arranged end toend so as to extend completely across the Fourdrinier wire 3. Theseblocks 25. 26 and 27 are mortised together at their ends. as shown inFigure 5, and are so arranged that the longitudinal grain of the sameextends in a direction which cuts through, for example, vertically, theplane of the wire 3. Furthermore, as shown in Figure 5, the said blocksof wood are on e upper faces of t 0 said blocks exreferably so arran edthat the grain tends substantially crosswise of the wire. In order toassist in holding the covers in proper positionwith regard to thehousing 19, a number of blocks 28 are provided which are secured bybolts 29 to the housing 19, said blocks being located adjacent the sideof the bridges 21.

In the operation of my invention, as the wire 3 travels in the directionof the arrow. as shown in Figure 3. the blocks 25, 26 and 27 will wearevenly and smoothly under the action of the wire, thus preventingchanneling and preventing the. formation of ridges in the surfaces ofthe same. Accordingly, also, the formation of corresponding ridges orunevennesses in the wire will be avoided. Furthermore, loss of time andlabor, due to frequent smoothing out any unevennesses in the surfaces ofthe blocks 25, 26 and 27, will be avoided inasmuch as it will not benecessary to re-surt'ace said blocks by planing or otherwise except,perhaps, when a new Fourdrinier wire is installed.

While I have described my invention above in detail I wish it to beunderstood that many changes may be made therein without departing fromthe spirit of the same.

I claim:

1. In a paper making machine, the combination of a Fourdrinier wire anda suction box having a cover comprising a wooden block having thelongitudinal grain of the wood extending in a direction which cutsthrough the path of the wire, at righthngles thereto, and so arrangedthat the annual growth rings in the face of the block extends crosswiseof the wire.

2. In a paper making machine, the combination of a Fonrdrinier wire anda suction box having a cover comprising a wooden block having thelongitudinal grain of the wood extending in a direction which cuts'through the path of the wire, said blockbeing carried in a groovedsupport set into the face of the block. a

3. In a paper making machine, the combination of a Fourdrinier wire anda suction box having a cover comprising a wooden block havin thelongitudinal grain of the wood exten ing in a direction which cutsthrough the path of the wire and at right angles thereto, said blockbeing carried in a grooved support set into the face of the block.

4. In a paper making machine, .the combination of a Fourdrinier wire anda suction box having a cover comprising a wooden block havin thelongitudinal grain of the wood exten 'ng in a direction which cutsthrough the path of the wire, at right angles thereto, and so arrangedthat the annual growth rings in the face of the block extends crosswiseof the wire, said block being carried in a grooved support at the baseof the block.

5. In a paper making machine, the combination of a Fourdrinier wire anda suction box having a cover comprising wooden blocks having thelongitudinal grain of the wood extending in a direction which cutsthrough the path of the wire, said blocks being carried in a dovetailedsupport, the blocks being inortised together at their ends.

6. In a paper making machine, the combination of a Fonrdrinier wire anda' suction box having a cover comprising wooden blocks having thelongitudinal grain of the wood extending in a direction which cutsthrough the path of the wire and at right an gles thereto, said blocksbeing carried in a dovetailed support, the blocks being mortisedtogether at their ends.

7.- In a. paper making machine, the comination of a Fourdrinier wire anda suction box having a cover comprising wooden blocks having thelongitudinal grain of the wood extending in a direction which cutsthrough the path of the wire, at right angles thereto, and so arrangedthat the annual growth rings in the faces of the blocks extendscrosswise of the wire, said blocks hei'ng carried in a dovetailedsupport, the blocks being mortised together at their ends.

'8. In a paper-making machine. the combination of a Fourdrinier wire anda suction box having a cover comprising spaced wooden blocks' placed endto end carried by grooved supports.'

9. In a paper-making machine, the combination of a Fourdrinier wire anda suction box having a cover comprising a plurality of wooden blockscarried by dovetailed supports, said supports being of substantiallyIthe same outside width as the block.

10. In aopaper making machine, the coinbination of a Fourdrinier wireand a suction FRED J. LATHAM.

